6v6gt:
Which browser did you clean the cache from? In this case your Arduino is acting as the browser (as a web client).
I clean the cache and cookies from Google Chrome. Oh, if that the case, is there a way to clean cache from Arduino (if there's any)?
This is what I get in apache.log file. I've tried run the test in several smartphones and it did update in the database, also same for the web browser in my PC. When I hit enter, the URL didn't change. It stays the same. But still, I tried again with Arduino, and it still don't update the value in the database.
192.168.0.121 - - [05/May/2018:17:14:35 +0800] "GET /arduino/getdata.php?sensor1=1&sensor2=1&sensor3=1 HTTP/1.1" 200 7
192.168.0.121 - - [05/May/2018:17:14:58 +0800] "GET /phpmyadmin/sql.php?server=1&db=arduino&table=dataaa&pos=0&token=c6a1554d934ae7d8c0c1a31c5c12cc8f HTTP/1.1" 200 12771
192.168.0.121 - - [05/May/2018:17:15:00 +0800] "POST /phpmyadmin/navigation.php?ajax_request=1&token=c6a1554d934ae7d8c0c1a31c5c12cc8f HTTP/1.1" 200 2497
192.168.0.121 - - [05/May/2018:17:15:00 +0800] "GET /phpmyadmin/index.php?ajax_request=1&recent_table=1&token=c6a1554d934ae7d8c0c1a31c5c12cc8f&no_debug=true&_nocache=1525511700438682684 HTTP/1.1" 200 1475
192.168.0.121 - - [05/May/2018:17:15:00 +0800] "GET /phpmyadmin/favicon.ico HTTP/1.1" 200 22486
192.168.0.142 - - [05/May/2018:17:15:23 +0800] "GET /arduino/getdata.php?sensor1=10&sensor2=20&sensor3=30 HTTP/1.1" 200 7
192.168.0.121 - - [05/May/2018:17:15:27 +0800] "GET /phpmyadmin/sql.php?server=1&db=arduino&table=dataaa&pos=0&token=c6a1554d934ae7d8c0c1a31c5c12cc8f HTTP/1.1" 200 12858
192.168.0.121 - - [05/May/2018:17:15:28 +0800] "POST /phpmyadmin/navigation.php?ajax_request=1&token=c6a1554d934ae7d8c0c1a31c5c12cc8f HTTP/1.1" 200 2497
192.168.0.121 - - [05/May/2018:17:15:29 +0800] "GET /phpmyadmin/favicon.ico HTTP/1.1" 200 22486
192.168.0.121 - - [05/May/2018:17:15:28 +0800] "GET /phpmyadmin/index.php?ajax_request=1&recent_table=1&token=c6a1554d934ae7d8c0c1a31c5c12cc8f&no_debug=true&_nocache=1525511728931850382 HTTP/1.1" 200 1475